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#include <stdio.h>
#include <string>
#include <vector>
#include <sys/types.h>
#include <sys/stat.h>
#include <fcntl.h>
#include <errno.h>
#include <unistd.h>
#include <string.h>
#include <sys/ioctl.h>
#include <stdlib.h>
#include <asm/types.h>
#include <arpa/inet.h>
#include <linux/random.h>
#include "error.h"
#include "utils.h"
#include "kernel_prng_io.h"
int kernel_rng_read_blocking(unsigned char *buffer, int n)
{
int fd = open(DEV_RANDOM, O_RDONLY);
if (fd == -1)
error_exit("Failed to open %s", DEV_RANDOM);
int rc = -1;
if (READ(fd, buffer, n) == n)
rc = n;
close(fd);
return rc;
}
int kernel_rng_read_non_blocking(unsigned char *buffer, int n)
{
int rc;
int fd = open(DEV_URANDOM, O_RDONLY);
if (fd == -1)
error_exit("Failed to open %s", DEV_URANDOM);
for(;;)
{
rc = read(fd, buffer, n);
if (rc == -1)
{
if (errno == EINTR || errno == EAGAIN)
continue;
error_exit("error reading from %s", DEV_URANDOM);
}
break;
}
close(fd);
return rc;
}
int kernel_rng_write_non_blocking(unsigned char *buffer, int n)
{
int rc;
int fd = open(DEV_URANDOM, O_WRONLY);
if (fd == -1)
return -1;
for(;;)
{
rc = write(fd, buffer, n);
if (rc == -1)
{
if (errno == EINTR || errno == EAGAIN)
continue;
error_exit("error writing to %s", DEV_URANDOM);
}
break;
}
close(fd);
return rc;
}
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